首先介绍差分格式，然后数值模拟非线性罗斯贝波扰动能量的演变，给出流场和扰动能量演变的示意图-Numerical method is to be used to investigate the evolutions of linear and nonliear Rossby wave of middle-high latitude in different seasons under the actual basic flow, we mainly discuss the evolutions of relative total energy and the structure of stream field for different initial field and basic flows